JVM IR: improve generation of receiver for bound callable references

Trick codegen into generating getfield from the anonymous class instead
of its supertype (e.g. kotlin.jvm.internal.FunctionReference,
PropertyReference or AdaptedFunctionReference). This gets rid of
unnecessary accessors in some cases, and will help in the subsequent
commit that changes logic around access to fields from Java
superclasses.

compiler/testData/codegen/bytecodeListing/callableReference/adaptedReference.ir.txt

@@ -4,7 +4,6 @@ synthetic final class A$testDefaultArguments$1 {
     enclosing method A.testDefaultArguments()V
     inner (anonymous) class A$testDefaultArguments$1
     method <init>(p0: java.lang.Object): void
-    public synthetic final static method access$getReceiver$p(p0: A$testDefaultArguments$1): java.lang.Object
     public synthetic bridge method invoke(): java.lang.Object
     public final @org.jetbrains.annotations.NotNull method invoke(): java.lang.String
 }
@@ -15,7 +14,6 @@ synthetic final class A$testDefaultArguments$2 {
     enclosing method A.testDefaultArguments()V
     inner (anonymous) class A$testDefaultArguments$2
     method <init>(p0: java.lang.Object): void
-    public synthetic final static method access$getReceiver$p(p0: A$testDefaultArguments$2): java.lang.Object
     public final @org.jetbrains.annotations.Nullable method invoke(@org.jetbrains.annotations.NotNull p0: kotlin.coroutines.Continuation): java.lang.Object
     public synthetic bridge method invoke(p0: java.lang.Object): java.lang.Object
 }